I cannot get the boolean difference modifier to work for these 2 cylinders as shown. What am I doing wrong? The normals on both cylinders are point outwards

enter image description here

  • 3
    $\begingroup$ have you tried to hide it or delete the boolean object after applying? $\endgroup$
    – moonboots
    Commented Sep 6, 2021 at 18:58
  • 1
    $\begingroup$ Try changing from 'Exact' to 'Fast' $\endgroup$
    – CoolCoder
    Commented Sep 7, 2021 at 3:53
  • $\begingroup$ @moonboots: I will check the next time. thanks $\endgroup$ Commented Sep 7, 2021 at 17:03

1 Answer 1


What you are doing works just fine. You can't see that it works because the Boolean modifier is non-destructive. Cylinder.001 still exists.

You can do one of several things, including but not limited to:

  1. Hide Cylinder.001 by clicking the eye icon in the outliner, or selecting it and typing H in the 3d Viewport resulting in the eye looking closed;

Outliner showing Cylinder.001 hidden

  1. Placing it in a different collection and hiding that collection;
  2. Applying the modifier and deleting Cylinder.001; or
  3. Changing its Viewport Display property to Bounds or Wire so that you can see that it still exists, but also see the Boolean effect.

Object properties showing Viewport Display dropdown.

Your choice depends on your workflow. A very popular workflow is to

  • Create a separate collection called something like Cutters and move it to that collection
  • Change its Viewport Display to wire or bounds.

This gives you the flexibility of hiding all of the cutters you are using, or only a few of them, while still allowing you to see both the result of the Boolean and why that result occurred. Here's an example:

Cylinder.001 moved to cutters collection

Cylinder.001 displayed as wire

The 3D Viewport:

The 3D Viewport that results

  • 1
    $\begingroup$ I like the idea of creating cutters. Works perfect for me! THanks alot! $\endgroup$ Commented Sep 7, 2021 at 17:02

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